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4G
1. 4G only: at+bmbandpref=7
2. LTE Only :
800MHz : at+bmbandpref=0x400000, 0x80000, 0x3F
1800MHz : at+bmbandpref=0x400000, 0x4, 0x3F
2600MHz : at+bmbandpref=0x400000, 0x40, 0x3F
Auto : at+bmbandpref=0x400000, 0x80044, 0x3F
For 3G
1. Set to 3G only:at+bmbandpref=1
900MHz : at+bmbandpref=0x2000000000000, 0x80044, 0x3F
2100MHz: at+bmbandpref=0x400000, 0x4, 0x3F
Auto : at+bmbandpref=0x400000, 0x80044, 0x3F
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